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A gas station store clerk in Arizona called police after she noticed a woman giving coffee to a baby girl. After reporting what she saw, police realized it was a 6-month-old and her grandmother who were the subject of an Amber Alert out of Huntington Beach. Beverly White reports for the NBC4 News at 11 p.m. Wednesday, July 2, 2014. (Published Wednesday, July 2, 2014)

Updated at 6:48 AM PDT on Thursday, Jul 3, 2014

A 6-month-old girl and her grandmother were found in Arizona on Wednesday evening within hours after an Amber Alert was issued to find them.

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The girl, Laylani Mosely, was reported missing Wednesday afternoon by a family member, according to Huntington Beach police and the California Highway Patrol.

Laylani and her grandmother, 57-year-old Carolyn Ferguson, were found just after 6 p.m. approximately 300 miles away at a gas station in Arizona's Maricopa County, Maricopa County sheriff's officials said.

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Ferguson's PT Cruiser had become disabled and was brought to the gas station by a mobile mechanic, according to Karen Akins, the gas station clerk credited with helping authorities locate the grandmother and baby.

Akins' boss confirmed that the pair were the focus of a California Amber Alert.

“She took the baby bottle and went to the cappuccino machine and filled it up with cappuccino,
And poured strawberry milk in with it and shook it. And tried to give the baby cappuccino,” Akins said.

Ferguson has a history of mental illness, police said.

Akins and a friend stalled Ferguson by chatting and changing Laylani's diaper, and then called authorities.

"It's a mom thing, I just, if it wasn't her baby, I was just, it would kill me if I let her walk out that door, (and) know later on that it wasn't hers and I could have done something," Akins, who is a mother herself, said.

Ferguson was taken into Maricopa County custody just outside Phoenix pending evaluation and extradition. She is expected to be in jail for at least a week or two, according to Maricopa County officials.

Laylani is with Arizona child welfare and is expected to reunite with her family Thursday or Friday.

Before being located, Ferguson was seen in the city of Fontana about 10 a.m. in a 2007 white PT Cruiser with the license plate #5UQZ701.